Master rebuild kit for the RG4R01A or JATCO JR403E automatic transmission
Year range: 1988-1998
Transmission make: Chevrolet, GM, GMC, Isuzu, Nissan UD, and Mitsubishi Fuso, 2-Ton Trucks
Engine: Inline 4 cylinder diesel
Rear wheel drive models with the 4 speed automatic transmission
This high quality transmission master overhaul rebuild kit contains
- All friction clutch plates
- 2-4 brake band
- Fluid filter
- Front pump bushing
- All rubber clutch piston seals
- All paper gaskets
- All O-rings
- All metal clad seals
- Teflon and steel sealing rings
- Duraprene pan gasket
The Transtec gasket overhaul set contained within this box kit is highly rated and used by most rebuild shops.
Additionally, you can add the following options to this rebuild kit:
- Steel clutch plates
- Full bushing kit
- Rostra solenoid pack – EPC, Overrun, shift solenoids
- Lockup solenoid
- Transgo shift kit or Superior shift correction kit
- Billet overdrive servo – Sonnax 62170-01K
Remember to soak all of your clutches in transmission fluid for thirty minutes before you install them.
This overhaul kit works in the following Chevrolet, GM, GMC, Isuzu, Mitsubishi Fuso, and Nissan UD applications.
- W3500 Tiltmaster, I4 diesel, 1988-1998*
- W3500 Forward, I4 diesel, 1988-1998*
- W4500 Forward, I4 diesel, 1988-1998*
- NPR, I4 diesel, 1988-1998*
- NPR HD, I4 diesel, 1988-1998*
- FE, I4 diesel, 1988-1998*
- FE-HD, I4 diesel, 1988-1998*
- FE-SP, I4 diesel, 1988-1998*
- FG, I4 diesel, 1988-1998*
- 1200, I4 diesel, 1988-1998*
- 1400, I4 diesel, 1988-1998*
*The JR403E or RG4R01A transmission ended in 1998. However, that year was a cross-over to a different transmission in these applications. If you are unsure about a 1998 model, please contact us for help.
This JATCO transmission is known by multiple names and codes, including: JR403E, RG4R01A, RG4RO1A, and RMK.